package com.atguigu.spzx.manager.service.Impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.spzx.common.exception.GuiguException;
import com.atguigu.spzx.manager.listener.ExcelListener;
import com.atguigu.spzx.manager.mapper.CategoryMapper;
import com.atguigu.spzx.manager.service.CategoryService;
import com.atguigu.spzx.model.entity.product.Category;
import com.atguigu.spzx.model.vo.common.ResultCodeEnum;
import com.atguigu.spzx.model.vo.product.CategoryExcelVo;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class CategoryServiceImpl implements CategoryService {
    @Autowired
    private CategoryMapper categoryMapper;

    @Override
    public List<Category> findCategoryList(Long id) {
        //1.根据id条件值进行查询，返回list集合
        List<Category> categoryList = categoryMapper.selectCategoryByParentId(id);

        //2.遍历返回的list集合
        //判断每个分类是否有下一层，如果有设置hasChildren = true
        if (!categoryList.isEmpty()) {
            for (Category category : categoryList) {
                int count = categoryMapper.selectCountByParentId(category.getId());
                if (count > 0) {
                    category.setHasChildren(true);
                } else {
                    category.setHasChildren(false);
                }
            }
        }

        return categoryList;
    }

    /**
     * 导出
     *
     * @param response
     */
    @Override
    public void exportData(HttpServletResponse response) {
        // 1.设置响应的头信息和其他信息
        try {
            // 设置响应结果类型
            response.setContentType("application/vnd.ms-excel");
            response.setCharacterEncoding("utf-8");
            // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
            String fileName = URLEncoder.encode("分类数据", "UTF-8");

//            设置响应的头信息
            response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");

            // 2.调用mapper方法查询所有分类，返回list集合
            List<Category> categoryList = categoryMapper.findAll();

            //最终list数据集合
            List<CategoryExcelVo> categoryExcelVoList = new ArrayList<>();
            //List<Category> --->List<CategoryExcelCo>
            for (Category category : categoryList) {
                CategoryExcelVo categoryExcelVo = new CategoryExcelVo();
                BeanUtils.copyProperties(category, categoryExcelVo);
                categoryExcelVoList.add(categoryExcelVo);
            }
            // 3.调用EasyExcel的write方法完成写操作
            EasyExcel.write(response.getOutputStream(), CategoryExcelVo.class)
                    .sheet("分类数据").doWrite(categoryExcelVoList);

        } catch (Exception e) {
            e.printStackTrace();
            throw new GuiguException(ResultCodeEnum.DATA_ERROR);
        }


    }

    /**
     * 导入
     *
     * @param file
     */
    @Override
    public void importData(MultipartFile file) {
        //监听器
        ExcelListener<CategoryExcelVo> excelListener = new ExcelListener<>(categoryMapper);
        try {
            EasyExcel.read(file.getInputStream(), CategoryExcelVo.class, excelListener)
                    .sheet().doRead();
            System.out.println("开始导入数据");
        } catch (IOException e) {
            e.printStackTrace();
            throw new GuiguException(ResultCodeEnum.DATA_ERROR);
        }
    }
}
